\documentclass{ctexart}
\usepackage{amssymb}
\title{Latex特殊字符}
\begin{document}
\maketitle
\begin{table}[ht!]
\centering
\caption{小写希腊字母}
\begin{tabular}{|l l | l l | l l |}
\hline\hline
$\backslash$alpha & $\alpha$ & $\backslash$beta & $\beta$ & $\backslash$gamma & $\gamma$\\
$\backslash$deta & $\delta$ & $\backslash$epsilon & $\epsilon$ & $\backslash$zeta & $\zeta$\\
$\backslash$eta & $\eta$ & $\backslash$theta & $\theta$ & $\backslash$iota & $\iota$\\
$\backslash$kappa & $\kappa$ & $\backslash$lambda & $\lambda$ & $\backslash$mu & $\mu$\\
$\backslash$nu & $\nu$ & $\backslash$xi & $\xi$ & $\backslash$pi & $\pi$\\
$\backslash$rho & $\rho$ & $\backslash$sigma & $\sigma$ & $\backslash$tau & $\tau$\\
$\backslash$upsilon & $\upsilon$ & $\backslash$phi & $\phi$ & $\backslash$chi & $\chi$\\
$\backslash$psi & $\psi$ & $\backslash$omega & $\omega$ & & \\
\hline
\end{tabular}
\end{table}

\begin{table}[ht!]
\centering
\caption{大写希腊字母}
\begin{tabular}{| l l | l l | l l |}
\hline\hline
$\backslash$Gamma & $\Gamma$ & $\backslash$Delta & $\Delta$ & $\backslash$Lambda & $\lambda$\\
$\backslash$Phi & $\Phi$ & $\backslash$Pi & $\Pi$ & $\backslash$Psi & $\Psi$\\
$\backslash$Sigma & $\Sigma$ & $\backslash$Theta & $\Theta$ & $\backslash$Upsilon & $\Upsilon$\\
$\backslash$Xi & $\Xi$ & $\backslash$Omega & $\Omega$ & & \\
\hline
\end{tabular}
\end{table}

\begin{table}[ht!]
\centering
\caption{其它希腊字母}
\begin{tabular}{| l l | l l | l l |}
\hline\hline
$\backslash$varepsilon & $\varepsilon$ & $\backslash$digamma & $\digamma$ (需要包amssymb)& $\backslash$varphi & $\varphi$\\
$\backslash$varkappa & $\varkappa$ & $\backslash$varpi & $\varpi$ & $\backslash$varrho& $\varrho$\\
$\backslash$varsigma & $\varsigma$ & $\backslash$vartheta & $\vartheta$ & & \\
\hline
\end{tabular}
\end{table}

\begin{table}[ht!]
\centering
\caption{常见字符}
\begin{tabular}{| l l | l l | l l |}
\hline\hline
$\backslash$aleph & $\aleph$ & $\backslash$beth & $\beth$ & $\backslash$daleth & $\daleth$\\
$\backslash$gimel & $\gimel$ & $\backslash$complement & $\complement$ & $\backslash$ell & $\ell$\\
$\backslash$eth & $\eth$ & $\backslash$hbar & $\hbar$ & $\backslash$hslash & $\hslash$\\		
$\backslash$mho & $\mho$ & $\backslash$partial & $\partial$ & $\backslash$wp & $\wp$\\
$\backslash$circledS & $\circledS$ & $\backslash$Bbbk & $\Bbbk$ & $\backslash$Finv & $\Finv$\\
$\backslash$Game & $\Game$ & $\backslash$Im & $\Im$ & $\backslash$Re & $\Re$\\
\hline
\end{tabular}
\end{table}
\end{document}